Audi A8L 4H 3.0 TDI CDTA Brake Vacuum Pipe Pressure Sensor 4H2611931B

Audi A8L 4H 3.0 TDI CDTA Brake Vacuum Pipe Pressure Sensor is a specialized brake system component designed for vehicles with a diesel engine. It is responsible for the precise measurement of vacuum in the brake line, which supports stable brake booster operation and improves vehicle control. This is a solution for users who expect consistent brake system performance and compatibility with the factory Audi architecture.

Specifications and technical data

• SKU: RHD-4H2611931B
• Mark: Audi
• Condition: Used
• OEM Part Number: 4H2611931B
• Substitutable numbers: 4H2611931B, 4H2 611 931 B
• Fuel type: Diesel
• Category: Brake Hoses, Lines & Fittings

Purpose and function of the vacuum sensor

The presented sensor has been designed for the Audi A8L 4H generation model with the 3.0 TDI CDTA unit, running on Diesel fuel. Its task is to monitor the vacuum in the brake line and transmit information to the appropriate control units, which allows for maintaining the proper level of brake assistance under various engine load conditions.

A stable vacuum reading translates into:

• more predictable brake pedal response,
• consistent booster operation at low and high RPMs,
• better cooperation with other brake system components.

Integration with the Audi brake system

The sensor operates in an area that includes Brake hoses, lines, and connectors, which is why its correct operation is important for the entire vacuum transmission line. The design is adapted to the Audi A8L 4H architecture, which facilitates installation in the factory location and limits the need for additional installation modifications.

This element is particularly important in vehicles with a diesel engine, where the generation and stabilization of vacuum require precise supervision. Thanks to this sensor, the brake system can maintain the appropriate operating characteristics even during dynamic highway driving or frequent braking in city traffic.

Product characteristics and condition

The offered vacuum sensor comes from an Audi vehicle and is a secondary market component in Used condition. This means it is an original part that was previously used and then designated for re-installation in another vehicle. Such components are often chosen by users looking for factory fitment and the preservation of the original logic of the brake system operation.

Thanks to maintaining compliance with the factory Audi design, the sensor can be a beneficial alternative to replacements, especially in the case of brake system repairs in premium class cars, where the consistency of all components' operation matters.

Application in vehicles with a diesel engine

Diesel engines, such as the 3.0 TDI CDTA, are characterized by different vacuum generation characteristics than gasoline units. For this reason, the use of a dedicated brake vacuum pipe pressure sensor is crucial for maintaining the proper level of assistance. The product is marked with the Diesel parameter, which confirms its intended use for systems powered by diesel fuel.

A well-chosen sensor in such a system helps to reduce fluctuations in assistance force, which affects driving comfort and safety, especially in a heavy, luxury sedan such as the Audi A8L.

Support with selection and additional materials

When working with used brake system components, it is worth following proven verification and installation procedures. To better prepare for assessing the condition of components and their safe selection, check out the guide: Second-hand brake system: how to safely choose discs, calipers, and ABS?. The article contains a practical checklist that helps make informed purchasing decisions in the area of brakes.

If you are planning a comprehensive repair or upgrade of the brake zone in your Audi and need other elements from the same group, such as flexible hoses, rigid pipe sections, or brake system connectors, check the available parts in the Audi brake hoses, lines, and connectors category.